The Collaborative International Dictionary of English v.0.48:

Knowingly \Know"ing*ly\, adv.
   1. With knowledge; in a knowing manner; intelligently;
      consciously; deliberately; as, he would not knowingly
      offend. --Strype.
      [1913 Webster]

   2. By experience. [Obs.] --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

knowingly
    adv 1: with full knowledge and deliberation; "he wittingly
           deleted the references" [syn: wittingly, knowingly]
           [ant: inadvertently, unknowingly, unwittingly]